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I had a similar problem. My gauge showed boost but it felt like it was running N/A. I had some exhaust leaks. There were leaks between the manifold and the turbo, from turbo to the elbow. So, when I got on the throttle most of the power was escaping from the leaks and not really spinning my compressor. The other problem I had was a knock sensor code. It threw my timing off. So, check your timing and ecu for codes.
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